Note 36 — Chapter IX
Reading edition
At sea-level the compensated aneroid (Casella, 1182) showed 30·05, the thermometer (F.) 66°. Here it was 27·10 in the open air, with the thermometer at 40° (F.), and in the pocket 26·90, with the thermometer at 80° (F.). The instrument, despite compensation, must always be cooled in the shade before use.